The keratinization of epidermal scales, feathers and hairs.
D000663:Amphibians; D000818:Animals; D001717:Birds; D005241:Feathers; D006197:Hair; D066298:In Vitro Techniques; D007633:Keratins; D008322:Mammals; D012104:Reptiles; D012867:Skin
D007633:Keratins